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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d934c507b462693044ce20bbc2a76b45b3e3ab229fd3cd78b6202f27c7c5a49' 
  AND token = 'GNU3THqfxqImTZyZvAwACMl1vwkEo/z5zr6IN/OFU1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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