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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c7f6ec46e8ee7780e59e20716b1d031eec063fae1e02e8de9e557d9508b309a' 
  AND token = 'P4mltRr+ojoBNqbs7wom8zpZXbJH87cFDjc6j9cL8qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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