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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbcdf07b1449f4ad1c44a46079ac83559933d976ca7dec168df665062f07a322' 
  AND token = 'ocrarcO25f6eahUfq5TZW5Hv4q8LQ45ud/RdkWy87y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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