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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6b278c18451ca87e733cdeb56dd171bbb2309bc7b0a8c12c11079c19718fa45' 
  AND token = 'jAKx5rdidTj3R9xSP0wmEsA7bG7Z58nODQGig/WLMAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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