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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739b2b989c95ae065ae6b1b9e1325aa2fd2138d20aa43e117c2a2a391b4a6b73' 
  AND token = 'Tnu8ED7AqWot5XlPxw11qh153KmEORSTBeLklwMVOgM=' 
  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"
    }
  }
}