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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e5b1c950fb8a31dd82a151db8e21be724b06912009b1a9b310ec828181d526' 
  AND token = '7eEetoY82CXyuo0FL+yzJ+5vwJCdF73Ru22g6bfrD+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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