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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23655876100fb4e2cd1a551ebe2cd0b20f9212a7c03feb891c271a5e9d21c1e1' 
  AND token = 'S5ZymFNzRbcg6tJNShrqU9nZCXkrLf15yvNK7DgFhHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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