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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfbfdc9a95dc679c9bae1972edf325005ebf70675314ced2d8c5829d7ab0c175' 
  AND token = '9J7IEv9R+bvCrOocTbxO4Jewu5YPkmiLR3j6Y0Q3YNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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