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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f4f029c6201742e17858bec17089a67a0aa5e9446480906a9ae64c578d995b' 
  AND token = 'rsH0LMk5S9I/Jt66YKajCZXuZBkRmnAys156U+HMkOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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