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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a200a0be65a78a1a8b0a0676a7e414c95882c2747e2e26229662983a951b92' 
  AND token = '5YykZB8pXLMjlQSE7oUz6vFN7lch8AR3O3ZIPIbJQrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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