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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16c362da1d17f034d008b6c010d79575f5c088a0fd430c4b39fc4b13c45144b0' 
  AND token = 'mDdJGhX6Rj6vWR46vtZ4digyvFLDH1sx9jArsA4UJcE=' 
  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"
    }
  }
}