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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21623d824be9343ba5ae0906d4a2162a2e4f86a2b230d4baf1c25b256676be69' 
  AND token = 'ULgOV6JeNrhSHZfepV/uHV+6M4+3Cir2IJpRF0xkgBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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