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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1743bc38f95c8e6055e2ab98b36875be2904e7a4a0c03ea1e45f052cd9477adc' 
  AND token = 'gJf5RWg6KiEkfS5Tih7iNll4ceHgqpLrjNPGbFwfSMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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