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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3feca1f3ea1ceed0753ad11f04fecac74b777f1b1dbb2ad89ca0d552095be92' 
  AND token = 'fEKyYJTlW7QNw/wtV+h5s5PfSt+XpQ5MVLyVcVY76sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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