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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a539452b6c5e9d5eabb70d656957669a9ae875363666ac966fea1b248103d59' 
  AND token = 'PrCDStnp9jmu86eSS9x1hdqheQcViUe9FibuP7/KQzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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