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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d2f56ced5607515aeff271cd95947efcc21cb64dc661b37bf0b8ee2124b510' 
  AND token = 'Agqe/VDptT5HL9WnbOONYLvb7+ccfJMiEU392iAznEM=' 
  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"
    }
  }
}