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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de9c52a404dda993d7f810f809a0c04b23181e5e504f5f8e7ea27b2dd2d78d01' 
  AND token = 'PXBhqDD4yug3EJrW/nF/smS2XLNfZMx8bdJtFHI8ISc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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