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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c89906b58ed9d413cb4493a3d0a91a3432970774c13f2bac6dcbae9d21f93b' 
  AND token = '8RYfzHbVDrfdjIY6d25VEYC5R3B33srnlNJNPPvqyAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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