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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e26062330a2896926b39b874b77d8ea6d47cb3f93bcc21641a59896474aa10f8' 
  AND token = 'Q8X092YLyuWu4jT9S1ugM3tXmGKWo//TIrQSxO/GG/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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