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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e109fae08a23b186fcd0c33733e3b0aa13cdbc9180ad11f3cf0da5971fe3cd6' 
  AND token = 'c129oV36DnC1Ti5HqnJPxJGDqvxwxj9HcBHXjPU8Pgg=' 
  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"
    }
  }
}