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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9421790e75a8c8e91f5e8b45fd519f5831675ac112174dd40358131b4ab5633b' 
  AND token = 'cnTqp5wOc42R3uZE8s57C7m4+aiH+mEZ3ixEkNyPNpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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