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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f55fa43ecb3f5be755cc0538b5bbe523b09ed1fd3925b6a65551ec4a0093173' 
  AND token = 'Z4q1/Dj3YsNEK0FFoSeLFphxREaoz0G6WvqFSbOOKt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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