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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '205a80e1d7baf3188281125c8593f1b601a697fe138da41d6f51d85df97f0485' 
  AND token = 'gvSsEq4BLTKGZ7L9nA4mEhk3cpa6uesAm05L8moiwd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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