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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d7a26bf4a04112d92c156cc44e23b627f116f6325a1afe01e55326eef3db02' 
  AND token = '3CJPE9QeoDuJE+0miEYtTYN6Ph5s4T25DweMjeyAfl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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