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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c8bd47ebbba5dc3089127cb0b88357fff7b3389c3a5cfe95803f9c02d22afe' 
  AND token = 'tdHCXrovmYSHYVOd+XXX1N2R1u/mBF/VgmLMULIzRQg=' 
  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"
    }
  }
}