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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8b8bce4b68594bfc6ca3e02ba7a0a739ae6bfc744e03ec78e4cc3b3f1c0103f' 
  AND token = 'S7qM4uotfYG+VQVd7NEuXT1ggqcvoAqITdK+hazMfPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}