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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8027ea702ca33fac22f8f48772d0fb9f3a5b819073301ea97f0194c8dd5ab5' 
  AND token = 'y278s9iRcbT3dFL12lt8vqHVlC7QTWEvNZZRfJXm4v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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