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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87870e8de0e5fc89b40a888d9d14df167f9c220c4789ab2c8a762b6730df7a4' 
  AND token = '9th1DV1kdQMwlt8Ey2qlTLlHz6zqckDqK/ynpfqdY64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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