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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cef9b500651b00990cbf2338b4d668262fcc285fc62728f69aa5e7751cccb1c' 
  AND token = 'UFnolJ9/I7CetTut0Kz5BXPUjWw31qt+rTGLkQbi67c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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