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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922338cce93de52ee56372cca1a219ce3b287751bf066fac305cfc882c94bc43' 
  AND token = '3R5JpFN76Fvf0mDMGBnQwt/eHNIEhUA5bba6Dl3ct+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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