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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e3baa16e6323e9b44888ab287f29228c01197b1e10b5c866ae91f9096a1372' 
  AND token = 'y59HMwkWR6fYseb8F1n7bYr/xytv5qM7o/yCQCtRiVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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