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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e762348af9951c331d2b4559e1f3630dcf009aefa11401d63f6c5f367a63fb9' 
  AND token = '7qwJWToOg0ov8EXIPT5fIDCh37vW3wtc48trXQQNfGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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