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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd796aed461e25bf7ee9e87f6467c5f67cf9bbf784dacc5189c24ba562c6b91e' 
  AND token = 'clh2ECXHXX32TiK0mkHMzSmpdBJfYed8y0cHVK8i4aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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