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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311505e7d2410010bc973ef7980ddb3bca3d73a98423799a732c76c17965b128' 
  AND token = 'KHjnMVXmA3v5fFDO+i9Cj06Fw5itLN8sx4T3KOvXsvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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