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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e5ed1aba04181fb1748d5e5710356017d152774342319ba98401732cf7c417' 
  AND token = 'kJ8hDL3Hi8uvi8X2q61aKy+pPhSqvmrM+18gwEDSbE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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