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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236f63386d6ecc3293dd0f040b52fb7bde175341cbbc5672b7d527cae74a556a' 
  AND token = 'AiYdTs19tTFNZhFarRW394uSoO0IWr0/N3rld/MK7hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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