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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c3249ad4ef692da65ed2af9a222134ad89216b6119ded513756e8249fb6e3d3' 
  AND token = 'sDPIEWVPzmv756B5QX2Pjdj9u4WshZJuK78xPBuxDN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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