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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d5d478eab2a7c5fa7255240aa26a553490617cac11cd98e59aef77301c65e7c' 
  AND token = 'ofya47GizWgv82ClHIBXM0QPx/I2u+RemlFlIHRCBI4=' 
  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"
    }
  }
}