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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0f24fd610cf3bb4fb0ba150c5c0f7a83de2e8acf361aa7df556fe1c3cc3008' 
  AND token = 'YCt0WACBhuOZ69gAY7QCLd7fVh34HLrfm4Q6tvTi730=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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