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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b4e34c4fca62795a8dd20d61d6f871bae6443a0f7ee2ebc103434d683d2e06' 
  AND token = 'NFJmeMnE7YICzangnqfMnKcZK8Cl4LAL/lUqIFrll90=' 
  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"
    }
  }
}