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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e45668db1f048c2cfb51fd024a1ce678d6c0b74bded91aa34bc7ad6d991a9ad1' 
  AND token = 'exZsRTt0XP+WJ4/G0jxgactKjlmG8Uvf3/og+JeyPlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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