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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d47cf28d622c45c3dc209b86a0b2c1a45c2cd1c50e4baed45c56c3348d39c7' 
  AND token = '9HD3ZBgcOY2J+eUg7Ci3w6efpqDxatcV980I+QHjdWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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